Conversion of Cray pointers to Fortran 90 pointers in a Ray tracing application

Abstract: This report is a documentation of techniques involved in the conversion of Cray pointers to Fortran 90 pointers in a ray-tracing application. A CAD object is generated and used for ray-tracing and the output is rendered on a pixel screen. Several implementations of ray-tracing were compared. A number of simulations were made to illustrate the properties of the code raypol. Spatial sub-division methods like Grid structures and BSP are implemented with pointers. Programming aspects relating to the use of pointers in the Fortran language are discussed. Portability is improved by conversion to Fortran 90 pointers and the use of other Fortran 90 features.